Question

Differentiate between autogenic and allogenic succession.

Answer 1

Sr. No.	Autogenic Succession	Allogenic Succession
1.	Succession caused by modifications in the environment made by the replacing community.	Succession caused by external forces unrelated to the community’s environmental effects.
2.	Community modifies the environment, leading to its own replacement.	External forces (such as climate, soil erosion, and flooding) drive community replacement.
3.	Environmental changes are due to biotic factors (community interactions).	Environmental changes are due to abiotic factors (physical or chemical forces).
4.	Internal biological processes of the community.	External physical or chemical forces.
5.	Community replacement is linked to self-modification of the environment.	Community replacement due to outside influences affecting the environment.